What is the difference of the polynomials? (5x3 - 2x2 + 9x - 12) - (6x2 - 5)

a 5x^3 - 4x^2 + 9x - 7
b 5x^3 - 8x^2 + 9x - 17
c 5x^3 - 8x^2 + 9x - 7
d 5x^3 + 4x^2 + 9x - 7

me

step-by-step explanation:

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents